Self-sealing shingle



Aug; 8, 1962 w. E. SCHENK 3,050,908

SELF-SEALING SHINGLE Filed July 18, 1960 2 Sheets-Sheet 1 FIG 1 2 LTERE. $CHENK AT TORNE YS Aug. 28, 1962 w. E. SCHENK SELF-SEALING SHINGLE 2Sheets-Sheet 2 Filed July 18, 1960 AT TORNE Ys United States Patent3,050,908 SELF-SEALING SHINGLE Walter E. Schenk, Minneapolis, Minn.,assignorto The B. F. Nelson Manufacturing Company, Minneapolis, Minn., acorporation of Minnesota Filed July 18, 1960, Ser. No. 43,611 Claims.(Cl. 50-243) My invention relates to flexible roofing shingles of thecomposition type and more particularly to improvements in self-sealingshingles of this general class.

Still more specifically my invention relates to flexible strip shinglesof the asphalt composition type. Such shingles conventionally includes ahead lap portion and an exposure portion which is divided into aplurality of laterally spaced exposure tabs by means of vertical slotsor cutout portions which extend from the lower edge of the exposureportion to substantially the medial line of the shingle.

An important object of my invention is the provision of novel means forsecurely adhering the exposure portion of each shingle in a roof to thehead lap portion of the shingle immediately therebelow, whereby theflexible exposure tabs will be rendered unliftable even by the strongestof winds, or the most adverse of weather conditions.

A still further and highly important object of my invention is theprovision of a shingle of the class immediately above described whichwill automatically cause selfsealing engagement between the lower edgeof each exposure tab in a roof with the head lap portion of the shingleimmediately therebelow, under the action of gravity.

A still further object of my invention is the provision of a device ofthe class above described wherein adhesive means is carried by each ofthe shingles in a manner and in a position to permit stacking of theshingles in the conventional manner, for purposes of shipment andstorage, without fear of causing a sealing relationship to be set upbetween the shingles in a bundle.

The above and still further objects of my invention will become apparentfrom the following detailed specification, appended claims, and attacheddrawings.

Referring to the drawings wherein like reference characters indicatelike parts throughout the several views:

FIG. 1 is a view in top plan of a shingle formed in accordance with myinvention;

FIG. 2 is a fragmentary view of a roof formed from the shingles of FIG.1;

FIG. 3 is an enlarged fragmentary sectional view as seen from the line33 of FIG. 2; and

FIG. 4 is a cross-sectional view illustrating a plurality of shinglesformed in accordance with my invention stacked one above the other toform a bundle.

Referring with greater particularity to the drawings, the numeral 1indicates in its entirety an elongated generally rectangular flexiblestrip shingle of conventional shape and preferably formed from asphaltcomposition. The shingle 1 comprises an elongated head lap portion 2 atits upper end and an exposure portion, identified in "ice coatings formno part of the instant invention, none is here shown in detail.

For the purpose of imparting self-sealing qualities to shingles of thetype above described, the upper surface 7 thereof is formed with agroove or recess 9 which, preferably and as shown, is gently dishedtransversely and extends from the opposite sides 10 uninterruptedly.Also preferably and as shown, the recess 9 is so positioned that thedeepest central portion 11 corresponds approximately to the medial lineof the shingle 1, the extreme lower limits 12 of said recess 9 extendingslightly below the upper limits 13 of the slots or cutouts 5. Within thedeepest central portion 11 of the recess 9, I provide a coating ofadhesive 14, preferably having pressure-sensitive char acteristics. Asshown, the adhesive coating 14 is in the nature of intermittentlongitudinally spaced strips 15.

Referring to FIG. 4, it will be observed that the upper limits 16 of theadhesive strips 15 lie below the plane of the upper surface 7 of theshingle 1. This arrangement makes it possible to stack and/ or bundle,for purposes of storage and shipment, any desired number of my shingles,as indicated by the letter A, without causing or permitting a sealingrelationship to be set up between the adhesive strips 15 and the flatlower surfaces 8 of the immediately overlying shingles 1.

On the other hand, as indicated by FIGS. 2 and 3 the lower edge portion6 of the exposure tabs 4 fall under the action of gravity into thegrooves or recesses 9 of the immediately underlying shingle 1, and thusinto selfits entirety by the numeral 3, at its lower end. Preferably andas shown, the exposure portion 3 is divided into a plurality of exposuretabs 4 by vertically extended longtudinally spaced slots or cutouts 5.Preferably and as shown, the cutouts 5 extend from the lower edge 6 ofthe exposure portion 3 to points close to but immediately below themedial line of the shingle 1. As shown particularly in FIGS. 3 and 4,the upper and lower surfaces 7, 8 of the shingle 1 are flat andgenerally parallel to each other. Conventionally, the upper surface 7 iscovered and protected by a suitable protective coating, such as silicagranules. However, in view of the fact that such sealing engagement withthe adhesive strips 15, when the shingles 1 of the bundle A are arrangedin a conventional manner to form a roof B. Preferably, the adhesivestrips 15 may have pressure-sensitive characteristics, although I do notdeem this to be essential with my novel construction, in view of thefact that the lower edge portion 6 of the exposure tabs 4 inevitablymake contact with the adhesive strips 15 within the underlying groovesor recesses 9, under the action of gravity. Consequently, seal ingcontact would, of necessity, be effected with any ad hesive which wouldbecome thermoplastic under summer heat, such as Fahrenheit.

My invention has been thoroughly tested and found to be completely.satisfactory for the accomplishment of the above objects, and while Ihave shown a preferred embodiment thereof, I wish it to be specificallyunderstood that same may be capable of modification without departurefrom the scope and spirit of the appended claims.

What I claim is:

1. A freely stackable nonadhering self-sealing flexible composition roofshingle body comprising a head lap portion and an exposure portion andhaving flat generally parallel upper and bottom surfaces, said uppersurface having an upwardly opening recess positioned between said headlap and exposure portions to receive the lower free edge of the exposureportion of a shingle overlapping said head lap portion when laid innormal course relationship, an adhesive coating in said recess, theupper limits of said coating lying below the plane of the upper surfaceof said head lap and exposure portions, whereby the free edge of saidexposure portion terminates within the confines of said recess to bedepressed therein and anchored by said adhesive coating in use and forpurposes of shipment and storage a plurality of said shingles may becompactly and freely stacked upon each other with the flat bottom ofeach thereof bridging the adhesive coating in the recess in the uppersurface of the underlying shingle.

2. The structure defined in claim 1, in which said shingle body isgenerally rectangular in shape, and in which said recess extendsuninterruptedly from side to side therethrough.

3. The structure defined in claim 1, in which said adhesive coating haspressure sensitive characteristics.

4. In a flexible strip shingle of the asphalt composition type andincluding a head lap portion and an exposure portion and having flatgenerally parallel upper and lower surfaces, the improvement whichcomprises providing an upwardly opening elongated recess in the uppersurface of said shingle strip which extends from end to end thereofgenerally along the medial line thereof so as to receive under theaction of gravity the lower free edge of. the exposure portion of anadjacent shingle overlap- References Cited in the file of this patentUNITED STATES PATENTS 1,592,760 Fischer July 13, 1926 2,132,999 ToppingOct. 11, 1938 2,935,416 Dunbar et a1. May 3, 1960 FOREIGN PATENTS CanadaApr. 26, 1960 wa-c I

